| 商佳尚， 王 宇 |
（北京长城计量测试技术研究所,北京 100095） |
 摘要：通过对光纤光栅传感器中影响应变传递过程的理论分析，建立了各相关因素与应变传递误差之间的数学解析模型，并给出了测量误差修正方案。首先，将光纤光栅传感器简化为由保护层包裹着中心的光纤纤芯轴对称结构；再分析应变传递过程中保护层的剪切变形对应变的传递造成影响；最后，建立应变传递层的应变传递误差与光纤实际变形、伸长值等之间的数学关系。研究结果表明，光纤的杨氏模量、横截面积以及应变传递层厚度越小；或者应变传递层的剪切模量及其与光纤的有效接触面积越大，则应变传递误差越小。该研究为光纤光栅应变传感器的优化设计提供了理论支持，并为实际测量过程中应变传递误差的定量补偿提供了可行方法。 |
| 关键词：光纤光栅传感器；应变传递误差；粘贴工艺；剪切变形；误差修正 |
| 中图分类号：TP212 文献标识码：A 文章编号：1000-8829(2009)03-0005-05 |
| Analysis and Correction of the Strain-Transfer Error in the Measurement with the Fibre Grating Sensor |
| SHANG Jia-shang, WANG Yu |
| (Changcheng Institute of Metrology & Measurement,Beijing 100095,China) |
| Abstract：Through the theoretical analysis on the straintransfer process in the fibre grating sensor,an analytical mathematical model is set up to relate the strain-transfer error with the corresponding factors,and a measurement error correction program is proposed.Firstly,the fibre grating sensor is simplified as a symmetric structure with the fibre core covered by the coating layer; secondly,the strain-transfer process is analyzed through the shear deformation of the coating layer;finally,the straintransfer error is expressed with the actual deformation of the fibre.According to the obtained formula,smaller Young’s modulus and crosssection area of the fibre and smaller thickness of the strain-transfer layer,or larger shear modulus of the strain-transfer layer and larger contact area with the fibre could reduce the straintransfer error.Besides providing a definite improvement direction of the fabrication craft and the adhesive craft,a feasible method is given to determine the correction factor to the strain-transfer error in practical measurement. |
| Key words：fibre grating sensor;straintransfer error;adhesive craft;shear deformation;error correction |
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